package com.example.lotterysystem.service.mq;

import cn.hutool.core.date.DateUtil;
import com.example.lotterysystem.common.config.DirectRabbitConfig;
import com.example.lotterysystem.common.exception.ServiceException;
import com.example.lotterysystem.common.utils.JacksonUtil;
import com.example.lotterysystem.common.utils.MailUtil;
import com.example.lotterysystem.common.utils.SMSUtil;
import com.example.lotterysystem.controller.param.DrawPrizeParam;
import com.example.lotterysystem.dao.dataobject.ActivityPrizeDO;
import com.example.lotterysystem.dao.dataobject.WinningRecordDO;
import com.example.lotterysystem.dao.mapper.ActivityPrizeMapper;
import com.example.lotterysystem.dao.mapper.WinningRecordMapper;
import com.example.lotterysystem.service.IDrawPrizeService;
import com.example.lotterysystem.service.activitystatus.IActivityStatusManager;
import com.example.lotterysystem.service.dto.ConvertActivityStatusDTO;
import com.example.lotterysystem.service.enums.ActivityPrizeStatusEnum;
import com.example.lotterysystem.service.enums.ActivityPrizeTiersEnum;
import com.example.lotterysystem.service.enums.ActivityStatusEnum;
import com.example.lotterysystem.service.enums.ActivityUserStatusEnum;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 功能描述:
 *
 * @author Lenovo
 * @date 2025/2/2
 */
@Slf4j
@Component
@RabbitListener(queues = DirectRabbitConfig.QUEUE_NAME)
public class MqReceiver {
    @Autowired
    private IDrawPrizeService drawPrizeService;
    @Autowired
    private IActivityStatusManager activityStatusManager;
    @Resource
    private ThreadPoolTaskExecutor threadPoolTaskExecutor;
    @Autowired
    private MailUtil mailUtil;
    @Autowired
    private SMSUtil smsUtil;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private WinningRecordMapper winningRecordMapper;

    @RabbitHandler
    public void process(Map<String, String> message) {
        log.info("mq接收到消息：{}", JacksonUtil.writeValueAsString(message));
        //获取存储的参数
        String paramString = message.get("messageData");
        DrawPrizeParam param = JacksonUtil.readValue(paramString, DrawPrizeParam.class);
        //处理抽奖流程
        try {
            //校验抽奖请求是否有效
            if (!drawPrizeService.checkDrawPrizeParam(param)) {
                return;
            }
            //设置活动，奖品，人员状态
            statusConvert(param);
            //保存中奖名单
            List<WinningRecordDO> winningRecordDOS = drawPrizeService.saveWinnerRecords(param);
            //通知
            syncExecute(winningRecordDOS);
        } catch (ServiceException e) {
            log.info("处理mq消息异常：{}，{}", e.getCode(), e.getMessage(), e);
            //保持事务一致性（回滚）
            rollback(param);
            //抛出异常：消息重试
            throw e;
        } catch (Exception e) {
            log.info("处理mq消息异常：", e);
            rollback(param);
            throw e;
        }
    }

    /**
     * 处理抽奖异常的回滚
     *
     * @param param
     */
    private void rollback(DrawPrizeParam param) {
        //判断状态是否需要回滚
        if (!statusNeedRollback(param)) {
            return;
        }
        //回滚
        rollbackStatus(param);
        //判断中奖者名单是否需要回滚
        if (!winnerNeedRollback(param)) {
            return;
        }
        rollbackWinner(param);
    }

    /**
     * 回滚奖品名单，删除奖品下的中奖人
     *
     * @param param
     */
    private void rollbackWinner(DrawPrizeParam param) {
        drawPrizeService.deleteRecords(param.getActivityId(), param.getPrizeId());
    }

    /**
     * 判断奖品名单是否需要回滚
     *
     * @param param
     * @return
     */
    private boolean winnerNeedRollback(DrawPrizeParam param) {
        //判断活动中的奖品是否存在中奖人
        int count = winningRecordMapper.countByAPId(param.getActivityId(), param.getPrizeId());
        return count > 0;
    }

    /**
     * 恢复相关状态
     *
     * @param param
     */
    private void rollbackStatus(DrawPrizeParam param) {
        ConvertActivityStatusDTO convertActivityStatusDTO = new ConvertActivityStatusDTO();
        convertActivityStatusDTO.setActivityId(param.getActivityId());
        convertActivityStatusDTO.setTargetActivityStatus(ActivityStatusEnum.RUNNING);
        convertActivityStatusDTO.setPrizeId(param.getPrizeId());
        convertActivityStatusDTO.setTargetPrizeStatus(ActivityPrizeStatusEnum.INIT);
        convertActivityStatusDTO.setUserIds(param.getWinnerList()
                .stream()
                .map(DrawPrizeParam.Winner::getUserId)
                .collect(Collectors.toList()));
        convertActivityStatusDTO.setTargetUserStatus(ActivityUserStatusEnum.INIT);

        activityStatusManager.rollbackHandlerEvent(convertActivityStatusDTO);
    }

    private boolean statusNeedRollback(DrawPrizeParam param) {
        // 由于修改奖品和人员状态时保证了事务一致性，所以判断一个就可以
        ActivityPrizeDO activityPrizeDO = activityPrizeMapper.selectPrizeByAPId(param.getActivityId(), param.getPrizeId());
        return ActivityPrizeStatusEnum.COMPLETED.name().equalsIgnoreCase(activityPrizeDO.getStatus());
    }

    private void syncExecute(List<WinningRecordDO> winningRecordDOList) {

        //并行
        //短信通知
        //threadPoolTaskExecutor.execute(() -> sendMessage(winningRecordDOList));
        //邮件通知
        threadPoolTaskExecutor.execute(() -> sendMail(winningRecordDOList));
    }

    /**
     * 发邮件
     *
     * @param winningRecordDOList
     */
    private void sendMail(List<WinningRecordDO> winningRecordDOList) {
        if (CollectionUtils.isEmpty(winningRecordDOList)) {
            log.info("中奖列表为空，无序发送");
            return;
        }
        for (WinningRecordDO winningRecordDO : winningRecordDOList) {
            String context = "Hi，" + winningRecordDO.getWinnerName() + "。恭喜你在"
                    + winningRecordDO.getActivityName() + "活动中获得"
                    + ActivityPrizeTiersEnum.forName(winningRecordDO.getPrizeTier()).getMessage()
                    + "：" + winningRecordDO.getPrizeName() + "。获奖时间为"
                    + DateUtil.formatTime(winningRecordDO.getWinningTime()) + "，请尽快领 取您的奖励！";
            mailUtil.sendSampleMail(winningRecordDO.getWinnerEmail(), "中奖通知", "");
        }
    }

    /**
     * 发短信
     *
     * @param winningRecordDOList
     */
    private void sendMessage(List<WinningRecordDO> winningRecordDOList) {
        if (CollectionUtils.isEmpty(winningRecordDOList)) {
            log.info("中奖列表为空，无序发送");
            return;
        }
        for (WinningRecordDO winningRecordDO : winningRecordDOList) {
            Map<String, String> map = new HashMap<>();
            map.put("name", winningRecordDO.getWinnerName());
            map.put("activityName", winningRecordDO.getActivityName());
            map.put("prizeTiers", ActivityPrizeTiersEnum.forName(winningRecordDO.getPrizeTier()).getMessage());
            map.put("prizeName", winningRecordDO.getPrizeName());
            map.put("winningTime", DateUtil.formatTime(winningRecordDO.getWinningTime()));
            smsUtil.sendMessage("SMS_478520502",
                    winningRecordDO.getWinnerPhoneNumber().getValue(),
                    JacksonUtil.writeValueAsString(map));
        }
    }

    /**
     * 设置状态
     *
     * @param param
     */
    private void statusConvert(DrawPrizeParam param) {
        ConvertActivityStatusDTO convertActivityStatusDTO = new ConvertActivityStatusDTO();
        convertActivityStatusDTO.setActivityId(param.getActivityId());
        convertActivityStatusDTO.setTargetActivityStatus(ActivityStatusEnum.COMPLETED);
        convertActivityStatusDTO.setPrizeId(param.getPrizeId());
        convertActivityStatusDTO.setTargetPrizeStatus(ActivityPrizeStatusEnum.COMPLETED);
        convertActivityStatusDTO.setUserIds(param.getWinnerList()
                .stream()
                .map(DrawPrizeParam.Winner::getUserId)
                .collect(Collectors.toList()));
        convertActivityStatusDTO.setTargetUserStatus(ActivityUserStatusEnum.COMPLETED);
        //处理状态
        activityStatusManager.handleEvent(convertActivityStatusDTO);
    }
}
